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Respiratory transition in the newborn: a three-phase process.
Stuart B Hooper1, Arjan B Te Pas2, Marcus J Kitchen3
1Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia Department of Obstetrics & Gynaecology, Monash University, Melbourne, Victoria, Australia.
Archives of Disease in Childhood. Fetal and Neonatal Edition
|November 7, 2015
Summary
The respiratory transition at birth involves three lung physiological phases. Optimized respiratory support, including sustained inflation and end-expiratory pressure, is crucial for infant lung development.
Area of Science:
- Neonatal Physiology
- Respiratory Medicine
Background:
- The transition from fetal to neonatal respiration is a complex physiological process.
- Understanding the sequential changes in the neonatal lung is critical for appropriate respiratory support.
Purpose of the Study:
- To propose a three-phase model for the respiratory transition at birth.
- To correlate specific physiological lung states with optimal respiratory support strategies.
Main Methods:
- Conceptual model based on physiological states of the neonatal lung.
- Analysis of fetal lung liquid dynamics and gas exchange during the transition.
Main Results:
- Phase 1: Airways are liquid-filled; focus on liquid clearance via sustained inflation.
- Phase 2: Gas exchange begins; risk of re-flooding necessitates end-expiratory pressure.
- Phase 3: Lung tissue cleared of liquid; focus shifts to managing lung immaturity/injury.
Conclusions:
- Optimizing respiratory support to match the lung's physiological phase improves outcomes.
- Sustained inflation is key in phase 1, while end-expiratory pressure is vital in phase 2.
- This phased approach to respiratory support is essential for successful neonatal respiratory adaptation.
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